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    <title>Document</title>
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    <div class="card">
        <div class="front">
            <p>大家好啊！</p>      
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        <div class="back">
            <p>我是小冯!</p>
            <p>很高兴遇见你!</p>
            <p>今天过得怎么样呢？</p>
            <p>一定要开心哟！</p>
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